CN101566289B - Backlight assembly and display device having the same - Google Patents
Backlight assembly and display device having the same Download PDFInfo
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- CN101566289B CN101566289B CN200910134121.4A CN200910134121A CN101566289B CN 101566289 B CN101566289 B CN 101566289B CN 200910134121 A CN200910134121 A CN 200910134121A CN 101566289 B CN101566289 B CN 101566289B
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- light
- pattern
- guide plate
- light source
- light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention provides a backlight assembly and a display device having the same. The backlight assembly includes a light source unit which generates light; and a light guide plate which comprises an incident light surface through which the light from the light source unit enters the light guide plate, an upper surface joined to the incident light surface and that includes a prism pattern, and a lower surface opposing the upper surface and formed with a plurality of concave portions. A diffusing pattern is formed on one of the upper surface and the lower surface.
Description
The application requires in the right of priority of in April, the 2008 10-2008-0038276 korean patent application that 24 Korea S Department of Intellectual Property submits to, and its full content is contained in this as a reference.
Technical field
The present invention relates to a kind of backlight assembly and a kind of display device with this backlight assembly, more specifically, thereby the present invention relates to backlight assembly and a kind of display device with this backlight assembly that a kind of generation that prevents dark space and clear zone provides light equably.
Background technology
In recent years, because traditional cathode-ray tube (CRT) (CRT) device can not meet the demand to thin and large-scale display device, therefore increasing to the demand of the panel display apparatus of for example plasma display (PDP) device, plasma addressed liquid (PALC) display device, liquid crystal display (LCD) device and Organic Light Emitting Diode (OLED) device.
As most popular flat-panel monitor (FPD), LCD comprises and is formed with a pair of substrate of electrode and is arranged on the liquid crystal layer between two substrates.When to electrode application voltage, the liquid crystal molecule reorientation of liquid crystal layer, thus control light transmission amount and show the image of expecting.
Because LCD is non-emissive device, therefore in order to show image, in LCD, must comprise the backlight assembly that contains light source.Backlight assembly is from liquid crystal panel back illumination light, and plays the effect of surface source of light, and this surface source of light is luminous to the whole region of liquid crystal panel.According to light source position, backlight assembly can be called as straight-down negative and edge-light-type.In direct type backlight assembly, light source is positioned under liquid crystal panel; And in edge-light-type backlight assembly, light source is positioned at the sidepiece of liquid crystal panel, light guide plate is for the whole region transmitted light to liquid crystal panel.
In order to improve the quality of display device, require backlight assembly to provide equably light beam for display panel.
Summary of the invention
Various aspects of the present invention provide a kind of generation that prevents dark space and clear zone that thereby the backlight assembly of light is provided equably.
Thereby various aspects of the present invention also provide a kind of display device that the generation that prevents dark space and clear zone provides the backlight assembly of light equably that has.
Yet aspect of the present invention is not limited to the various aspects of illustrating here.By reference detailed description of the present invention given below, above and other aspect of the present invention will become clearer to those skilled in the art in the invention.
According to an aspect of the present invention, provide a kind of backlight assembly, this backlight assembly comprises: the light source cell that produces light; Light guide plate, described light guide plate comprises light incident surface, upper surface and lower surface, light from described light source cell enters described light guide plate through described light incident surface, described upper surface is connected to described light incident surface and comprises prism pattern, described lower surface is relative with described upper surface, and described lower surface comprises a plurality of sunk parts.Diffusing pattern is formed on in described upper surface and described lower surface.
According to a further aspect in the invention, provide a kind of backlight assembly, this backlight assembly comprises: the light source cell that produces light; Light guide plate, described light guide plate comprises light incident surface, upper surface and lower surface, light from described light source cell enters described light guide plate through described light incident surface, described upper surface is connected to described light incident surface and has prism pattern, described lower surface is relative with described upper surface, and described lower surface comprises a plurality of sunk parts; Optical sheet, described optical sheet is arranged on described light guide plate top, and described optical sheet comprises first surface and the second surface relative with described first surface.Diffusing pattern is formed on in described first surface and described second surface.
According to another aspect of the invention, provide a kind of display device, this display device comprises: display panel, and this display panel shows image; Backlight assembly, described backlight assembly comprises light source cell, light guide plate and optical sheet, described light source cell provides light to described display panel, described light guide plate comprises light incident surface, upper surface and lower surface, light from described light source cell enters described light guide plate through described light incident surface, described upper surface is connected to described light incident surface and has prism pattern, and described lower surface is relative with described upper surface and comprise that a plurality of sunk parts, described optical sheet are arranged on described light guide plate top.Diffusing pattern is formed on in described light guide plate and described optical sheet.
Accompanying drawing explanation
According to the detailed description of exemplary embodiment of the present invention and with reference to accompanying drawing, it is clearer that above and other of the present invention aspect and feature will become, in the accompanying drawings:
Fig. 1 is according to the decomposition diagram of the display device of first embodiment of the invention;
Fig. 2 is the fragmentary, perspective view of the light guide plate in Fig. 1;
Fig. 3 is the bottom perspective view of the light guide plate in Fig. 1;
Fig. 4 is the fragmentary, perspective view of the light guide plate that comprises according to the display device of second embodiment of the invention;
Fig. 5 is the bottom perspective view of the light guide plate in Fig. 4;
Fig. 6 is the fragmentary, perspective view of the light guide plate that comprises according to the display device of third embodiment of the invention;
Fig. 7 is the cut-open view along the line VII-VII ' intercepting in Fig. 6;
Fig. 8 shows the revision for execution example of the light guide plate in Fig. 6;
Fig. 9 is according to the decomposition diagram of the backlight assembly of fourth embodiment of the invention;
Figure 10 is the cut-open view along the line X-X ' intercepting in Fig. 9;
Figure 11 is the rear view of the prismatic lens of the backlight assembly in Fig. 9;
Figure 12 shows the revision for execution example of the backlight assembly in Figure 10;
Figure 13 is according to the decomposition diagram of the backlight assembly of fifth embodiment of the invention;
Figure 14 is the cut-open view along the line XIV-XIV ' intercepting in Figure 13;
Figure 15 is the rear view of the diffusion disk of the backlight assembly in Figure 13.
Embodiment
Now with reference to accompanying drawing, the present invention is described more fully, exemplary embodiment of the present invention shown in the drawings.Yet the present invention can implement in many different forms, and should not be construed the embodiment that is confined to proposed here.But it will be thorough with completely providing these embodiment to make the disclosure, and design of the present invention will be conveyed to those skilled in the art fully.
In addition, can use relative terms here, as " ... under ", " in ... below ", " below ", " in ... top " and " above ", be used for describing an element as depicted in the figures and the relation of another element.It should be understood that relative terms is intended to the different azimuth that comprises the device the orientation except being described in the drawings.For example, if the device in accompanying drawing is reversed, be described as " " element of other element D score side will be positioned as subsequently " " other element " on " side.Similarly, if the device in a width figure is reversed, be described as " " other element " below " or " under " element will be positioned as subsequently " " other element " top ".Thereby, exemplary term " ... under " and " in ... below " can comprise " in ... top " and " in ... below " two kinds of orientation.
Hereinafter, with reference to Fig. 1, to Fig. 3, describe according to the liquid crystal display of first embodiment of the invention.Fig. 1 is according to the decomposition diagram of the display device of first embodiment of the invention, and Fig. 2 is the fragmentary, perspective view of the light guide plate in Fig. 1, and Fig. 3 is the bottom perspective view of the light guide plate in Fig. 1.
With reference to Fig. 1, according to the liquid crystal display 10 of the embodiment of the present invention, comprise liquid crystal panel assembly 20, backlight assembly 100, middle boxes 120, upper fixator 110 and lower fixator 170.
Liquid crystal panel assembly 20 comprises liquid crystal panel 30, liquid crystal layer (not shown), gate drivers IC (integrated circuit) 21, data chip film packaging part 22 and printed circuit board (PCB) 23.
Liquid crystal panel 30 comprises lower display panel 31 and the upper display panel 36 being oppositely arranged with lower display panel 31, wherein, on lower display panel 31, be formed with gate line (not shown), data line (not shown), thin film transistor (TFT) array and pixel electrode, on upper display panel 36, be formed with color filter, black matrix and common electrode.Selectively, color filter and common electrode can be formed on lower display panel 31.
Gate drivers IC 21 is directly integrated on lower display panel 31, and is connected to every the gate line (not shown) being formed on lower display panel 31.Data chip film packaging part 22 is connected to every the data line (not shown) being formed on lower display panel 31.Data chip film packaging part 22 is semi-conductor chips, and described semi-conductor chip comprises the TAB winding that is formed on epilamellar wiring pattern and utilizes TAB (the automatic combination of winding) technology combination.As example, carrier band packaging part (TCP) or membrane of flip chip (COF) can be for data chip film packaging parts 22.But the present invention is not limited thereto, these are example.
The various driving elements that can process gate drive signal and data drive signal are installed on printed circuit board (PCB) 23, thereby gate drive signal can be input to gate drivers IC 21, and data drive signal can be input to data chip film packaging part 22.
In addition, backlight assembly 100 comprises optical sheet 130, light guide plate 140, light source cell 150 and reflector plate 160.
Light guide plate 140 guides to liquid crystal panel assembly 20 by the light being provided by light source cell 150, and the panel that light guide plate 140 is formed by the Plastic transparent material such as acryhic material is made.Light guide plate 140 is for guiding the liquid crystal panel 30 that is arranged on light guide plate 140 tops into from the light of light source cell 150 transmittings.
In the present embodiment, backlight assembly 100 belongs to edge-light-type.Therefore, light source cell 150 is configured to edge-light-type structure, and in edge-light-type structure, light source cell 150 is set to a side of light guide plate 140.Light source cell 150 comprises light source.
Refer again to Fig. 2 and Fig. 3, light guide plate 140 comprises light incident surface 141, upper surface 143, lower surface 142, sunk part 145 and prism pattern 144.Light incident surface 141 is formed on a side surface of light guide plate 140, and is adjacent to light source 151, and light is entered in light guide plate 140 by light incident surface 141.Upper surface 143 is perpendicular to light incident surface 141, and comprises prism pattern 144.Lower surface 142 is relative with upper surface 143 and comprise a plurality of sunk parts 145.
Light guide plate 140 comprises various patterns, thereby makes the light that enters light guide plate 140 by light incident surface 141 be drawn towards liquid crystal panel 30.Such pattern can comprise the sunk part 145 being formed in lower surface 142.
Sunk part 145 is formed in lower surface 142 with channel shape structure, and the identical direction of the direction of edge and light incident surface 141 is extended.Sunk part 145 comprises catoptrical inclined-plane, the light of the scheduled volume that provides by light incident surface 141 is reflected, thereby changes light path, makes light upwards and towards liquid crystal panel 30.For making sunk part 145 effectively change by this way light path, each sunk part 145 comprises can catoptrical the first inclined-plane 145a and the second inclined-plane 145b.The first inclined-plane 145a of each sunk part 145 and the second inclined-plane 145b form pitch angle and intersect line with lower surface 142 respectively, thereby tilt to upper surface 143.The first inclined-plane 145a of each sunk part 145 and at least one in the second inclined-plane 145b are towards light incident surface 141.The light of the scheduled volume therefore, providing by light incident surface 141 is by the first inclined-plane 145a reflection and offer liquid crystal panel 30.The pitch angle of the first inclined-plane 145a of each sunk part 145 can change as required.
Sunk part 145 can form like this, that is, along with the distance apart from light incident surface 141 increases, the spacing between adjacent recessed part 145 changes.The region between sunk part 145 of lower surface 142 (hereinafter referred to " flat surfaces ") can be formed parallel with upper surface 143, or can angulation, thereby forms the positive gradient or negative slopes with respect to upper surface 143.
Lower surface 142 coordinates with upper surface 143, so that the light providing by light incident surface 141 to be provided, thereby makes light arrive the region away from light incident surface 141.Lower surface 142 can be formed parallel with upper surface 143.Selectively, distance between lower surface 142 and upper surface 143 can reduce in the following manner gradually,, along with the distance apart from light incident surface 141 increases, distance between lower surface 142 and upper surface 143 reduces, thereby the distance that light is advanced before by the first inclined-plane 145a reflection increases to certain amount, described in the amount that increases to larger than the amount forming at a predetermined angle in the situation of lower surface 142.Therefore, through the light of light incident surface 141, can more effectively be transferred to apart from the farther distance of light incident surface 141, the light that makes requirement reflects and is transmitted to liquid crystal panel 30 from the first inclined-plane 145a of sunk part 145.
The degree of depth of sunk part 145 can change as required.The light providing from light source 151 is very strong near the position of light incident surface 141, and along with the increase of the distance apart from light incident surface 141, light weakens.Therefore, for the whole region to liquid crystal panel 30 provides light equably, it is a small amount of making the component at the light being reflected by sunk part 145 near the location of light incident surface 141, and the component of the light being reflected by sunk part 145 increases pro rata with the distance apart from light incident surface 141.
In order to change by this way the light being reflected by sunk part 145, can change the degree of depth of sunk part 145.Selectively, sunk part 145 can be made into identical size (being the identical degree of depth), and the density relevant with the number of the sunk part 145 forming in presumptive area can increase, thereby makes the amount of the light that is reflected even.
As mentioned above, the upper surface 143 of light guide plate 140 is formed with prism pattern 144.Prism pattern 144 converges the light of light guide plate 140 transmittings, thereby makes vertically to be guided on liquid crystal panel 30 through the light of light guide plate 140.
Prism pattern 144 can form by the extended configuration to light guide plate 140 opposite sides with the side from light guide plate 140, and can be formed with a plurality of continuous pattern elements, or is formed with the separated a plurality of pattern elements of predetermined space.The section of prism pattern 144 can comprise triangle, semicircle or half elliptic element." semicircle " used herein comprises the shape that is similar to a round part, is not to refer to accurate semicircle; " half elliptic " used herein comprises the shape that is similar to an oval part, is not to refer to accurate semiellipse.
The section shape of prism pattern 144 and area can change on demand.Such as, the section shape of prism pattern 144 can be that semicircle or triangular element are arranged between semiellipse element, and the sectional area of prism pattern 144 can adopt in such a way, that is, adjacent elements has different areas.
The lower surface 142 of light guide plate 140 comprises diffusing pattern 146a, and diffusing pattern 146a is for scattered light and prevent bright spot or the generation of clear zone and dim spot or dark space.Diffusing pattern 146a can be formed on the surface of sunk part 145, maybe can be formed on the flat surfaces between sunk part 145.Diffusing pattern 146a scattering is through the light of light guide plate 140 inside, thereby preventing that whole inside that light passes light guide plate 140 by multiple reflections is reflected makes light can not pass upper surface 143 outgoing.Diffusing pattern 146a is formed on the lower surface 142 of light guide plate 140, thereby to the gathering due to light or because light does not arrive the position execution compensation that ad-hoc location forms clear zone and dark space.That is, diffusing pattern 146a causes the variation of light path, and this has prevented owing to producing dark space that interference of light causes and the generation in clear zone.
Diffusing pattern 146a is formed on the lower surface 142 of light guide plate 140, and can be to form near the concentrated mode of light incident surface 141.Light guide plate 140 is included in lower surface 142 sunk part 145 forming and the prism pattern 144 forming on upper surface 143, therefore interference of light occurs and in formation dark space, position and clear zone near light incident surface 141.By forming diffusing pattern 146a near light incident surface 141, the utilizing emitted light equably from the whole region of light guide plate 140.Diffusing pattern 146a can be formed on and can extend to the region of about 70mm from light incident surface 141.
Can be by with sand-blasting machine, lower surface being processed to form diffusing pattern 146a, or can form diffusing pattern 146a by the coating of deposition scattered light.Diffusing pattern 146a can be formed on the whole lower surface 142 of light guide plate 140, or can only be formed on the region that approaches light incident surface 141 of lower surface 142.
The light source 151 of light source cell 150 provides light to liquid crystal panel 30.Backlight assembly 100 can comprise one or more light sources 151, and light source 151 is separated in the row of the length along light source cell 150, and has space between light source 151.Pointolite (as light emitting diode (LED)) or line source (as cold-cathode fluorescence lamp (CCFL) or hot-cathode fluorescent lamp (HCFL)) can be used as light source 151.
Reflector plate 160 is arranged on the below of light guide plate 140, and the light that points to below from light guide plate 140 is reflected back along the direction making progress.(described light is not by lower surface 142 internal reflections of light guide plate 140 and be not formed on sunk part 145 internal reflections in lower surface 142 for reflector plate 160 reflected light, and pass light guide plate 140), make this light reenter light guide plate 140 and can pass completely through light guide plate 140 towards liquid crystal panel 30.Therefore, reflector plate 160 reduces the loss of the light of light source 151 transmittings, and further offers the uniformity of light of liquid crystal panel 30.
Optical sheet 130 is arranged on the top of light guide plate 140, thus diffusion converge the light through light guide plate 140 transmissions.Optical sheet 130 can comprise one or more in diffusion disk (not shown), prismatic lens (not shown) and screening glass (not shown).Diffusion disk disperses the light receiving from light guide plate 140, concentrated in some region to prevent light.Prismatic lens is formed with prism, and described prism is formed on the upper surface of prismatic lens with the layout of being scheduled to, and the light that is diffused sheet diffusion is vertically focused on liquid crystal panel 30.Therefore, through the most light of prismatic lens, vertically advance, make the illuminance distribution on screening glass.In addition, the surface of screening glass protection prismatic lens, and dispersed light, thus improve photodistributed homogeneity.
According to the liquid crystal display 10 of the embodiment of the present invention, comprise prism pattern 144, make single prismatic lens or the single screening glass on single prismatic lens can be used as optical sheet 130.In addition, when obtaining sufficient convergence effect by prism pattern 144, do not need independent prismatic lens, can only use screening glass.
As mentioned above, prism pattern 144 is formed in light guide plate 140, therefore can avoid using in some cases extra prismatic lens or diffusion disk.
Referring to figs. 1 through Fig. 3, reflector plate 160, light source cell 150, light guide plate 140 and optical sheet 130 are accommodated in lower fixator 170 with such order.Support made and is configured to by lower fixator 170 by metal material, described support provides sufficient protection to resist external impact also can be for the object of ground connection.
Middle boxes 120 comprises 4 sidewalls, forms rectangle frame structure.Middle boxes 120 is placed downwards, thereby around the sidewall of lower fixator 170, middle boxes 120 is installed.
Liquid crystal panel 30 is arranged on the top of screening glass and is placed in middle boxes 120.For preventing that the element in middle boxes from being damaged, middle boxes 120 can be formed made by plastic material framed.
Upper fixator 110 is placed downwards, thereby covers the upper surface that is contained in the liquid crystal panel 30 in middle boxes 120, and upper fixator 110 invests lower fixator 170.In upper fixator 110, be formed with the window that exposes liquid crystal panel 30.The same with the situation of lower protector 170, frame made and is configured to by upper fixator 110 by metal material, and described frame provides sufficient protection to resist external impact also can be for the object of ground connection.Upper fixator 110 can be connected and be invested lower fixator 170 by hook.In addition, the printed circuit board (PCB) 23 of liquid crystal panel assembly 20 can extend beyond middle boxes 120 outer surface and can be crooked along the outer surface of middle boxes 120, thereby against side surface or the basal surface of lower fixator 170, place.
Below with reference to Fig. 4 and Fig. 5, the liquid crystal display according to second embodiment of the invention is described.Fig. 4 is the fragmentary, perspective view of the light guide plate that comprises according to the display device of second embodiment of the invention, and Fig. 5 is the bottom perspective view of the light guide plate in Fig. 4.Identical label for the second embodiment at operation and the configuration aspects element identical with element in the first embodiment, to the description of these elements, will no longer repeat.
In the light guide plate 140_1 comprising according to the liquid crystal display of second embodiment of the invention, can adjust the Density Distribution that is formed on the diffusing pattern 146b on lower surface 142.
Diffusing pattern 146b can mainly be formed on light guide plate 140_1 light incident surface 141 near.For example, can reduce the density of the diffusing pattern 146b in adjacent light incidence surface 141 regions, and can improve apart from the density of the diffusing pattern 146b in the region at light incident surface 141 preset distance place far away.As another example, can reduce the density of the diffusing pattern 146b in contiguous light source 151 regions, and can improve apart from the density of the diffusing pattern 146b in the region at light source 151 preset distance place far away.
Light guide plate 140_1 comprises the prism pattern 144 being formed on upper surface 143 and is formed at the sunk part 145 on lower surface 142, makes light path complicated and unordered.As a result, in some region of light guide plate 140_1, just may form clear zone and dark space.By forming by this way diffusing pattern 146b, that is, improve the density of the diffusing pattern 146b of the position that forms clear zone, and reduce the density of the diffusing pattern 146b of the position that forms dark space, the light in clear zone is diffused pattern 146b scattering, and moves to dark space.Therefore, improved the homogeneity of light on whole light guide plate 140_1.
Such phenomenon (forming clear zone and dark space) is caused by reflection of light and interference.Other factors that affect position, size and the pattern formation of clear zone and dark space comprise the formation of thickness and prism pattern 144 and the sunk part 145 of light guide plate 140_1.The Density Distribution of diffusing pattern 146b can change according to the position of such clear zone and dark space.For example, clear zone may be formed at the position of contiguous light source 151 (supposing has a plurality of light sources), and dark space may be formed at the position between light source 151.In this case, in the position of contiguous light source 151, can improve the density of diffusing pattern 146b, and the position in region can reduce the density of diffusing pattern 146b between light source 151.
As shown in Figure 4 and Figure 5, lower surface 142 can comprise region 147a and region 147b, wherein, region 147a adjacent light source unit 150 also extends along the length direction of light source cell 150, and region 147b adjacent domain 147a also separates with light source cell 150 by region 147a.Region 147a comprises the first row of the high density area 148a of diffusing pattern 146b and the low density area 148b of diffusing pattern 146b.The first row is adjacent to and is parallel to the light source row in light source cell.In the 147a of region, high density area 148a can be positioned at the position relative with light source 151, low density area 148b also can be relative with the space in light source cell 150 between the 148a of high density area, therefore high density area 148a and low density area 148b replace along the length direction of region 147a, or equally along light source cell 150 length alternately.
Region 147b comprises the second row of the high density area 148a replacing with low density area 148b.It is relative with the low density area 148b in the 147a of region that high density area 148a in the 147b of region is configured to, and in the 147b of region, low-density 148b district is configured to relative with the high density area 148a in the 147a of region.
The first row and the second row can be considered to the row in rectangular matrix.Matrix pattern can comprise the other row forming according to region 147a and the similar region of region 147b, and each so other region comprises the high density area of the diffusing pattern 146b that the low density area with diffusing pattern 146b replaces.
In optional layout, in the first row, it is relative with light source 151 that the low density area of diffusing pattern can be arranged to, and it is relative with the space in light source cell 150 that the high density area of diffusing pattern 146b can be arranged to, and in the second row, pattern is contrary.
According to the variable density of the diffusing pattern 146b of clear zone and dark space, be not limited to matrix pattern, diffusing pattern 146b can form radially according to the mode centered by each light source 151, or can be irregularly formed.
In addition, there is no need to make diffusing pattern 146b to be only formed in the region at light incident surface 141 preset distance places, diffusing pattern 146b can partly be formed on apart from the region of light incident surface 141 a distance, is partly formed on the region near light incident surface 141.
Below with reference to Fig. 6, to Fig. 8, the liquid crystal display according to third embodiment of the invention is described.Fig. 6 is the fragmentary, perspective view of the light guide plate that comprises according to the display device of third embodiment of the invention, and Fig. 7 is the cut-open view along the line VII-VII ' intercepting in Fig. 6, and Fig. 8 shows the revision for execution example of the light guide plate in Fig. 6.Identical label by for the 3rd embodiment at operation and the configuration aspects element identical with element in the first embodiment, to the description of these elements, will no longer repeat.
According in the liquid crystal display of third embodiment of the invention, the diffusing pattern 246a of light guide plate 140_2 is formed in prism pattern 144.
Prism pattern 144 is formed on the upper surface 143 of light guide plate 140_2, and has half elliptic section.Diffusing pattern 246a is formed on the surface of prism pattern 144.As in embodiment above, because the formation of the sunk part 145 in the lower surface 142 of light guide plate 140_2 and the prism pattern 144 on upper surface 143 causes interference of light, therefore may in the region of the light incident surface 141 near light guide plate 140_2, form clear zone and dark space.By form diffusing pattern 246a (result forms diffusing pattern 246a on the upper surface 143 of light guide plate 140_2) in prism pattern 144, can prevent the formation of clear zone and dark space.
The section of prism pattern 144 can comprise triangle, semicircle or half elliptic element.(as mentioned above, " semicircle " comprises the shape that is similar to a round part, is not to refer to accurate semicircle, and " half elliptic " comprises the shape that is similar to an oval part, is not to refer to accurate semiellipse.) section shape of prism pattern 144 can also be like this, that is, there is difform element and be alternately arranged in prism pattern 144.The sectional area of prism pattern 144 can also change as required.
Diffusing pattern 246a can only form on the predetermined portions of prism pattern 144.That is, light path changes according to the section shape of prism pattern 144, and diffusing pattern 246a can be formed in region corresponding to the path of taking with light.For example, when prism pattern 144 is semicircular element while forming by section, diffusing pattern 246a can only be formed near the region summit of semi-circle shaped elements of prism pattern 144, maybe can concentrate on the summit of the semi-circle shaped elements of prism pattern 144.Selectively, in the apex region of the semi-circle shaped elements of prism pattern 144, can omit diffusing pattern 246a, or diffusing pattern 246a can be formed on low-density the apex region of the semi-circle shaped elements of prism pattern 144.As another, select, diffusing pattern 246a can only be formed in the groove between the element of prism pattern 144 or described groove around, or can form high density in these regions.
With reference to Fig. 8, according in the light guide plate 140_3 of this revision for execution example, the density of the diffusing pattern 246b forming in prism pattern 144 changes according to position.That is, the density of diffusing pattern 246b can be according to changing in every way with the degree of closeness of light source 151 (supposing has a plurality of light sources 151).Therefore, diffusing pattern 246b can form differently according to the position of light source 151, also can change according to formation, size and the position of prism pattern 144 and sunk part 145.
The matrix pattern of describing in conjunction with the present invention's the second exemplary embodiment can be applied to prism pattern 144.
With reference to Fig. 9 to Figure 12, describe according to the backlight assembly of fourth embodiment of the invention hereinafter.Fig. 9 is according to the decomposition diagram of the backlight assembly of fourth embodiment of the invention, Figure 10 is the cut-open view along the line X-X ' intercepting in Fig. 9, Figure 11 is the rear view of the prismatic lens of the backlight assembly in Fig. 9, and Figure 12 shows the revision for execution example of the backlight assembly in Figure 10.
According to the backlight assembly 100 ' of fourth embodiment of the invention, comprise prismatic lens 130a, light guide plate 140 ', there is light source cell 150 and the reflector plate 160 of light source 151.
The light that light guide plate 140 ' provides light source 151 is directed to liquid crystal panel assembly 20 (seeing Fig. 1), and the panel that light guide plate 140 ' is formed by Plastic transparent material (as acryhic material) is made.Light guide plate 140 ' is for guiding the liquid crystal panel 30 (seeing Fig. 1) that is arranged on light guide plate 140 ' top into from the light of light source 151 transmittings.
Light guide plate 140 ' comprises light incident surface 141, upper surface 143, lower surface 142, sunk part 145 and prism pattern 144.Light incident surface 141 is formed on a side surface of light guide plate 140 ', and is adjacent to light source 151, and light is entered in light guide plate 140 ' by light incident surface 141.Upper surface 143 is perpendicular to light incident surface 141, and comprises prism pattern 144.Lower surface 142 is relative with upper surface 143 and comprise a plurality of sunk parts 145.
Light guide plate 140 ' comprises various patterns, thereby makes the light that enters light guide plate 140 ' by light incident surface 141 be drawn towards liquid crystal panel 30 (seeing Fig. 1).Such pattern can comprise the bevelled sunk part 145 of formation.
Prismatic lens 130a is arranged on the top of light guide plate 140 ' and converges the light that light guide plate 140 ' is crossed in transmission.Prismatic lens 130a is formed with prism with the layout of being scheduled in surface thereon, and the light providing from light guide plate 140 ' is vertically converged to liquid crystal panel 30 (seeing Fig. 1).Therefore, through most of light of prismatic lens 130a, vertically advance, make the illuminance distribution on screening glass (not shown).Prismatic lens 130a comprises first surface 131a and the second surface 131b relative with first surface 131a, on second surface 131b, is formed with prism pattern.On first surface 131a, can form diffusing pattern 346a.
What diffusing pattern 346a adjustment provided from light guide plate 140 ' may be inhomogeneous light, makes described light become even.Diffusing pattern 346a can only be formed in the region of the light incident surface 141 that approaches light guide plate 140 ' most.In addition, the density of diffusing pattern 346a can be according to the position of light source 151 (supposing has a plurality of light sources 151), from the distance of light source 151 and the thickness of light guide plate 140 ', change.
Reflector plate 160 is arranged on the below of light guide plate 140 ', so that the light that points to below from light guide plate 140 ' is reflected back along the direction making progress.(described light is not by lower surface 142 reflections of light guide plate 140 ' and be not formed on sunk part 145 reflections in lower surface 142 for reflector plate 160 reflected light, and through light guide plate 140 '), make this light reenter light guide plate 140 ' and can pass completely through light guide plate 140 ' towards liquid crystal panel 30 (seeing Fig. 1).Therefore, reflector plate 160 reduces the loss of the light of light source 151 transmittings, and further offers the uniformity of light of liquid crystal panel 30 (seeing Fig. 1).
Figure 11 is the rear view of the prismatic lens in the backlight assembly in Fig. 9.Diffusing pattern 346a as shown in Figure 11 comprises the high density area that is arranged to matrix pattern and the low density area of describing with reference to the present invention's the second exemplary embodiment.Selectively, this matrix pattern can be formed on the upper surface 131b of prismatic lens 130a.
With reference to Figure 12, in the revision for execution example of the backlight assembly 100 ' of the 4th embodiment, prismatic lens 130a ' comprises that first surface 131a is with relative with first surface 131a and comprise the second surface 131b of prism pattern.In addition, in this revision for execution example, it is upper that diffusing pattern 346b is formed at second surface 131b, that is, diffusing pattern 346b is formed in the prism pattern of second surface 131b.
With reference to Figure 13 to Figure 15, describe according to the backlight assembly of fifth embodiment of the invention hereinafter.Figure 13 is according to the decomposition diagram of the backlight assembly of fifth embodiment of the invention, and Figure 14 is that Figure 15 is the rear view of the diffusion disk of the backlight assembly in Figure 13 along the cut-open view of the line XIV-XIV ' intercepting in Figure 13.
According to the backlight assembly 100 of fifth embodiment of the invention " comprise prismatic lens 130a, diffusion disk 130b, light guide plate 140 ', the light source cell 150 with light source 151 and reflector plate 160.
The light that light guide plate 140 ' provides light source 151 is guided liquid crystal panel assembly 20 (seeing Fig. 1) into, and the panel that light guide plate 140 ' is formed by plasticity transparent material (as acryhic material) is made.Light guide plate 140 ' is for being directed to the light from light source 151 transmittings the effect of the liquid crystal panel 30 (seeing Fig. 1) that is arranged on light guide plate 140 ' top.Light source 151 can be single source.
Light guide plate 140 ' comprises light incident surface 141, upper surface 143, lower surface 142, sunk part 145 and prism pattern 144.Light incident surface 141 is formed on a side surface of light guide plate 140 ', and is adjacent to light source 151, and light is entered in light guide plate 140 ' by light incident surface 141.Upper surface 143 is perpendicular to light incident surface 141, and comprises prism pattern 144.Lower surface 142 is relative with upper surface 143 and comprise a plurality of sunk parts 145.
Light guide plate 140 ' comprises various patterns, thereby makes the light that enters light guide plate 140 ' by light incident surface 141 be drawn towards liquid crystal panel 30 (seeing Fig. 1).Such pattern can comprise the bevelled sunk part 145 of formation.
Diffusion disk 130b and prismatic lens 130a are arranged on the top of light guide plate 140 ', thus diffusion converge the light through light guide plate 140 ' transmission.The light that diffusion disk 130b diffusion is irradiated from light guide plate 140, concentrated in some region to prevent light.Prismatic lens 130a thereon surface is above formed with prism with the layout of being scheduled to, and the light that is diffused sheet 130b dispersion is vertically converged on liquid crystal panel 30 (seeing Fig. 1).Therefore, through most of light of prismatic lens 130a, vertically advance, make the illuminance distribution on screening glass (not shown).The surface of screening glass protection prismatic lens 130a, and dispersed light, thus photodistributed homogeneity improved.
Diffusion disk 130b comprises diffusing pattern 446.What diffusing pattern 446 adjustment provided from light guide plate 140 ' may be inhomogeneous light, makes described light become even.Diffusing pattern 446 can only be formed in the region of the light incident surface 141 that approaches light guide plate 140 ' most.In addition, the density of diffusing pattern 446 can be according to the position of light source 151 (supposing has a plurality of light sources 151), from the distance of light source 151 and the thickness of light guide plate 140 ', change.
In Figure 14, diffusing pattern 446 is illustrated on the lower surface of diffusion disk 130b.Selectively, diffusing pattern can be formed on the upper surface of diffusion disk 130b.
Reflector plate 160 is arranged on the below of light guide plate 140 ', so that the light that points to below from light guide plate 140 ' is reflected back along the direction making progress.(described light is not by lower surface 142 internal reflections of light guide plate 140 ' and be not formed on sunk part 145 internal reflections in lower surface 142 for reflector plate 160 reflected light, and through light guide plate 140 '), make this light reenter light guide plate 140 ' and can pass completely through light guide plate 140 ' towards liquid crystal panel 30 (seeing Fig. 1).Therefore, reflector plate 160 reduces the loss of the light of light source 151 transmittings, and further offers the uniformity of light of liquid crystal panel 30 (seeing Fig. 1).
Figure 15 shows the rear view of the diffusion disk of the backlight assembly in Figure 13.Figure 15 illustrates the matrix pattern on the lower surface of diffusion disk 130b.In conjunction with the present invention's the second exemplary embodiment, this matrix pattern has been described.Selectively, this matrix pattern can be formed on the upper surface of diffusion disk.
Although illustrate particularly and described the present invention with reference to exemplary embodiment of the present invention, but what it should be understood by one skilled in the art that is, in the situation that do not depart from the spirit and scope of the present invention that are defined by the claims, can make in the present invention the various changes in form and details.
Claims (8)
1. a backlight assembly, described backlight assembly comprises:
Produce the light source cell of light;
Light guide plate, described light guide plate comprises light incident surface, upper surface and lower surface, light from described light source cell enters described light guide plate through described light incident surface, described upper surface is connected to described light incident surface and comprises prism pattern, described lower surface is relative with described upper surface, and described lower surface comprises a plurality of sunk parts
Wherein, be formed with diffusing pattern on one in described upper surface and described lower surface,
Described diffusing pattern comprises the high density area of diffusing pattern and the low density area of diffusing pattern,
The described high density area of diffusing pattern and the described low density area of diffusing pattern are alternately arranged in described upper surface and described lower surface,
Described lower surface is parallel with described upper surface,
The degree of depth of described sunk part changes.
2. backlight assembly as claimed in claim 1, wherein, described diffusing pattern is formed in described prism pattern.
3. backlight assembly as claimed in claim 1, wherein, described diffusing pattern is formed on described lower surface.
4. backlight assembly as claimed in claim 1, wherein, each sunk part in described sunk part comprises the first inclined-plane and the second inclined-plane that tilt with pitch angle with respect to described lower surface.
5. backlight assembly as claimed in claim 1, wherein, described light source cell comprises a plurality of light sources, described light source is separated in being expert at, the described high density area of diffusing pattern and the described low density area of diffusing pattern are alternately arranged on described in described upper surface and described lower surface according to matrix pattern, described matrix pattern comprises the first row that contiguous described light source cell arranges, described the first row comprise described diffusing pattern be configured to the low density area relative with described light source and described diffusing pattern be configured to and described light source between relative high density area, space.
6. backlight assembly as claimed in claim 1, wherein, described light source cell comprises a plurality of light sources, described light source is separated in being expert at, the described high density area of diffusing pattern and the described low density area of diffusing pattern are alternately arranged on described in described upper surface and described lower surface according to matrix pattern, described matrix pattern comprises the first row that contiguous described light source cell arranges, described the first row comprise described diffusing pattern be configured to the high density area relative with described light source and described diffusing pattern be configured to and described light source between relative low density area, space.
7. a backlight assembly, described backlight assembly comprises:
Produce the light source cell of light;
Light guide plate, described light guide plate comprises light incident surface, upper surface and lower surface, light from described light source cell enters described light guide plate through described light incident surface, described upper surface is connected to described light incident surface and has the first prism pattern, described lower surface is relative with described upper surface, and described lower surface comprises a plurality of sunk parts;
Optical sheet, described optical sheet is arranged on described light guide plate top, and described optical sheet comprises first surface and the second surface relative with described first surface,
Wherein, diffusing pattern is formed on in described first surface and described second surface,
Described diffusing pattern comprises the high density area of diffusing pattern and the low density area of diffusing pattern,
The described high density area of diffusing pattern and the described low density area of diffusing pattern are alternately arranged in described first surface and described second surface,
Described lower surface is parallel with described upper surface,
The degree of depth of described sunk part changes.
8. backlight assembly as claimed in claim 7, described backlight assembly also comprises the second prism pattern being formed on described first surface, wherein, described diffusing pattern is formed in described the second prism pattern.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020080038276 | 2008-04-24 | ||
| KR1020080038276A KR101429176B1 (en) | 2008-04-24 | 2008-04-24 | Back-light assembly and display device having the same |
| KR10-2008-0038276 | 2008-04-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101566289A CN101566289A (en) | 2009-10-28 |
| CN101566289B true CN101566289B (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910134121.4A Expired - Fee Related CN101566289B (en) | 2008-04-24 | 2009-04-24 | Backlight assembly and display device having the same |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7976207B2 (en) |
| JP (2) | JP5648206B2 (en) |
| KR (1) | KR101429176B1 (en) |
| CN (1) | CN101566289B (en) |
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| JP2003057642A (en) * | 2001-08-09 | 2003-02-26 | Hitachi Ltd | Liquid crystal display device |
| CN1508602A (en) * | 2002-12-20 | 2004-06-30 | 鸿富锦精密工业（深圳）有限公司 | Area light source device and light board thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR101429176B1 (en) | 2014-08-13 |
| US20090268484A1 (en) | 2009-10-29 |
| JP2009266819A (en) | 2009-11-12 |
| JP2014132581A (en) | 2014-07-17 |
| KR20090112406A (en) | 2009-10-28 |
| JP5648206B2 (en) | 2015-01-07 |
| US7976207B2 (en) | 2011-07-12 |
| JP5746389B2 (en) | 2015-07-08 |
| CN101566289A (en) | 2009-10-28 |
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